Decades: 1190s 1200s 1210s 1220s 1230s - 1240s - 1250s 1260s 1270s 1280s 1290s
Years: 1240 1241 1242 1243 1244 - 1245 - 1246 1247 1248 1249 1250
Births
Deaths
... numerically, the usual form of the quadratic formula is not ideal. See Loss of significance for details. Derivation The quadratic formula is derived by the method of ...